Generally, filtration can be looked as mechanical sieving for separating solids from fluid.

The filtration techniques have evolved over a period of time for developing effective mechanism for achieving techno-economic solution for your needs. The techniques and media cane be listed as per time development and efficiency for different applications.

• Clarifiers, settling
• Wire mesh strainers
• Paper band, pad filters
• Pressure, vacuum leaf
• Centrifuge, bag filter, and
• Cartridge filters.

For fine filtration application, i.e., micro filtration cartridge filters are proved to be very efficient and cost effective provided correct media is selected with correct methodology.

Micro Filtration: Different Media for Micro Filtrations

Surface Filtration

Thin media with all the pores within the media in the same plane; clogs by particulate load reducing the open porous structure; and reducing flow rates. As an effect of low porosity and low pore density more surface is to be provided for given flow rate. For providing more area pleating is done.

Depth Filtration

Particles are trapped in the depth of the media therefore dirt holding capacity increases. Theoretically particles can be of uniform size and shape, which happens only for testing. In practice the particles are not of same size, there is a wide range of distribution. In case if surface of depth media gets covered, the depth is unutilized. For getting the technical advantage of media the graded density structure is preferred. For effective filtration for most industrial applications a series of filters are used i.e. 25m? 10m? 5m? 1m?0.4m?0.2m depending on the final application and need. As per the particle size distribution above-mentioned series is modified for desired duty condition for economic solution.

The need of the above mentioned series is justified only in the case of graded density so as to get maximum life of filter elements.

For example generally 5m element at the edges is 10m, and 1m element at the edges is 5m, so effective filtration is 10m-5m and 5m-1m.

Conclusion

For effective and techno-economic washing application the role of micro filtration is very important. For selection of micro filter, mechanism and media plays an important role. For getting optimised results filter elements like Vats Bonflow with rigid and graded density depth filters are proven effective.

Vats Filtration Technologies Pvt Ltd is also working in the field of industrial filtration along with the many other fields including pharmaceutical, food and beverages, water, chemicals, solvents, etc.

Vats Resin Bonded Media has proven effective for various industrial applications such as:

• Transformer oil
• Hydraulic oil
• Honing oil
• Lubricating oil
• Gear oil
• MTO
• Mineral solvents
• Emulsified coolants, and
• Glycol - water (fire resistant hydraulic fluid) filtration, etc.

The degree of filtration achievable with Vats' specially developed media can be as fine as Nass class 2 or less with off line filtration.

The Advantages for Locomotives

Heavy off-road automobiles like earthmovers, coal mining machinery, dumpers, etc., use large quantities of machine oil/gear oil/ lubricating oil, hydraulic oil, etc.

Most of the time the vehicles on site are exposed to extreme conditions like enormous amounts of particulate load, higher temperature, moisture contamination, etc. Generally the in-built systems provided on the vehicle are just enough to take care particulate load as per standard conditions at standard temperature. In practice it is different, so oil change out is early or viscosity changes so lubrication is not to the mark. So it is important to do filtration well up to desired degree of filtration, i.e., Nass Class and desired ppm level of moisture. Vats has developed the media for oil filtration and also for moisture removal - the sizes for the both media as cylindrical with 50 mm dia. Vats filters deliver advantages such as:

• Quality improvement of the existing filtration system
• Techno-economic filtration solutions to existing and future needs
• Reduction in the overall filtration cost with improved quality
• Increase the life of existing costly imported filters
• Longer life, i.e., fewer change outs resulting in consistent quality
• Reduction in inventory cost
• Elevated temperature capability up to 100?C
• Rigid construction, constant